Refractive predictability in eyes with intraocular gas tamponade – results of a prospective controlled clinical trial

Figures & data

Table 1 Patients’ baseline data

Variable	Combined surgery with gas (G1, n=15)		Combined surgery without gas (G2, n=19)		Cataract surgery-only (G3, n=18)		P-value#
	Range (min/max)	Mean (±SD)	Range (min/max)	Mean (±SD)	Range (min/max)	Mean (±SD)	G1 vs G2	G1 vs G3	G2 vs G3
Age (years)	58.8/78.3	68.7 (±5.9)	59.5/83.1	71.7 (±6.1)	49.0/84.7	67.0 (±9.9)	0.708	1.00	0.187
CDVA (decimal)	0.05/0.50	0.30 (±0.16)	0.05/0.60	0.32 (±0.16)	0.10/0.60	0.29 (±0.13)	1.00	1.00	1.00
Sphere (D)	−7.25/2.75	−0.20 (±3.13)	−4.25/5.25	1.00 (±2.07)	−1.75/5.75	1.81 (±1.89)	0.432	0.054	0.931
Cylinder (D)	−2.00/0.00	−0.98 (±0.65)	−1.75/0.00	−0.61 (±1.19)	−1.75/−0.25	−0.74 (±0.40)	0.552	1.00	1.00
SE (D)	−7.63/2.50	−0.71 (±3.18)	−4.63/4.50	0.70 (±2.00)	−2.00/5.38	1.44 (±1.85)	0.264	0.030	1.00
ACD (mm)	1.70/3.45	2.62 (±0.50)	1.84/4.41	2.59 (±0.60)	1.90/4.41	2.76 (±0.57)	1.00	1.00	1.00
AL (mm)	22.11/28.15	24.05 (±1.64)	21.35/27.15	23.33 (±1.37)	21.35/25.22	23.13 (±0.94)	0.275	0.115	1.00
CRT (μm)	293/601	407 (±75)	295/671	470 (±91)	267/554	377 (±93)	0.114	0.982	0.007

Note:

# Bonferroni post hoc test.

Abbreviations: ACD, anterior chamber depth (measured with Pentacam); AL, axial length; CDVA, best corrected distance visual acuity; CRT, central retinal thickness; SE, spherical equivalent; G1, group 1; G2, group 2; G3, group 3; SD, standard deviation.

Table 2 Differences between groups in the main postoperative outcome measures after surgery

Variable	Combined surgery with gas (G1, n=15)		Combined surgery without gas (G2, n=19)		Cataract surgery-only (G3, n=18)		P-value
	Range (min/max)	Mean (±SD) or median (Q25/Q75)	Range (min/max)	Mean (±SD) or median (Q25/Q75)	Range (min/max)	Mean (±SD) or median (Q25/Q75)	G1 vs G2	G1 vs G3	G2 vs G3
PE##	−2.25/0.21	−0.68 (−1.75/−0.15)	−2.13/0.98	−0.66 (−1.17/−0.22)	−1.84/0.88	0.04 (−0.83/0.25)	1.00	0.122	0.129
SE## (D)	−2.88/0.00	−0.88 (−1.13/−0.38)	−2.63/0.75	−0.75 (−1.38/−0.50)	−2.00/0.75	−0.13 (−0.88/0.00)	1.00	0.121	0.189
ACD# (mm)	2.20/5.72	4.24 (±1.02)	2.82/5.41	4.18 (±0.65)	2.50/4.98	3.97 (±0.64)	1.00	0.952	1.00
AL# (mm)	21.92/28.06	24.19 (±1.85)	21.23/27.15	23.20 (±1.41)	21.23/25.23	23.10 (±0.95)	0.157	0.100	1.00

Notes:

# Bonferroni post hoc test.

## Non parametric Mann–Whitney test, Bonferroni adjusted. In these cases, the respective median values (including quartiles) compared as variables were not normally distributed.

Abbreviations: ACD, anterior chamber depth (measured with Pentacam); AL, axial length; PE, prediction error; SE, spherical equivalent; G1, group 1; G2, group 2; G3, group 3; SD, standard deviation.

Table 3 Patients’ outcome data

Variable	Combined surgery with gas (G1, n=15)		Combined surgery without gas (G2, n=19)		Cataract surgery-only (G3, n=18)		P-value
	Range (min/max)	Mean (±SD) or median (Q25/Q75)	Range (min/max)	Mean (±SD) or median (Q25/Q75)	Range (min/max)	Mean (±SD) or median (Q25/Q75)	G1 vs G2	G1 vs G3	G2 vs G3
CDVA# (decimal)	0.04/1.00	0.53 (±0.28)	0.10/0.80	0.53 (±0.24)	0.60/1.00	0.80 (±0.11)	1.00	0.003	0.002
Sphere## (D)	−2.75/1.25	−0.03 (−0.75/0.00)	−2.25/3.00	−0.25 (−1.00/0.25)	−1.75/1.00	0.25 (−0.25/0.50)	1.00	0.626	0.498
Cylinder## (D)	−2.75/0.00	−1.22 (±0.88)	−4.50/−0.25	−1.26 (±0.99)	−2.25/−0.25	−0.86 (±0.60)	1.00	0.692	0.470
CRT^‡ (μm)	216/495	336 (±75)	245/719	425 (±100)	269/552	363 (±77)	0.014	1.00	0.104

Notes:

# Bonferroni post hoc test.

## Non parametric Mann–Whitney test, Bonferroni adjusted. In these cases, the respective median values (including quartiles) compared as variables were not normally distributed.

Abbreviations: CDVA, best corrected distance visual acuity; CRT, central retinal thickness; G1, group 1; G2, group 2; G3, group 3; SD, standard deviation.